Improvement in securing knobs to their shanks



"I HOMUAS J. SLOAN, OF NEW YORK, N. Y.

Letters Patent No. 88,918, dated A prz'l 13, 1869.

UVIPRO'V'EMENT IN SECURING- KNOBS TO THEIR- SHANKS.

The Schedule referred to in these Letters Patent and making part of the sama.

To all whom it may concern:

Be it known that I, THOMAS J. SLoAN,`of the city, county, and State of New York, have invented a new `and useful Improvement in Securing Metallic Shanks to Door-Knobs made of porcelain and other earthenware; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being vhad to the accompanying drawings, making part of this specification, in which- Figure -1 isan elevation of a knob, with a metal shanksecured thereto;

Figure 2, a section taken in the plane of theaxis of the shank;

Figure 3, a section taken in the plane of the line A a. of n'g. 2; and

Figure 4, the several parts represented separately. My said invention relates 'to an improvement in the method of securing metallic Shanks to knobs made of porcelain and other earthenware.

Metallic shanks have heretofore been secured in such knobs by softmetal, which melts at a suiciently `low temperature to be run into the cavity of the knob,

and around the hard-metal shank, or which is suiiiciently ductile to admit of being packed into the cavity to secure the hard-metal shank.

Experience' has proved that these methods are defective, because in use the soft metal soon yields, and the knob becomes loose.

f The object of my invention is to effect a more solid and ,durable connection between the knob and the shank; and to this end- Mysaid invention consists in soforming the cavity .in the knob, that a hard-metal plate can be readily inserted, so that when partly turned at the bottom of the cavity portions of the plate 'will pass into lateral cavities or under projections, so that it cannot be construction which I deem the best.

I form the knob a, either in the act of moulding or afterwards, with a cavity, b, to receive the inner end of the metallic shank c, and I prefer to make this part of the shank with two angular wings or feathers, d (l, one on each of two opposite sides, the cavity in the knob being of a form suitable to receive the said wings or feathers.

At the bottom of the cavity, the recesses e e', which receive' the feathers d d of the shank, areextended for a short distancev around, forming two grooves, f, one -on each side, as represented.

A plate of hard metal, g, of a form whiclrwill readily enter the cavity b of the knob,'and with two wings i t' is formed with a central hole to receive'the shank of aser-ew,4 k, having a flat head below the plate.

The shank of this screw is threaded to it and screw into the bore of the inner end of the shank c, and the outward extremity is nicked, as at l, to receive a screwdriver, or otherwise formed, so that it can be turned by a driver o'r key to be inserted in the tubular shank from the other end.

The parts being so formed, the .plate g, with the screw k is inserted inthe cavity of the knob with the head of the screw towards the bottom of the cavity,

.and when the plate reaches tbe bottom, it is turned and, by insertingva screw-driver through the shank and turning the screw, the shank is drawn into the cavity of the knob and there secured, so that it can neither turn nor become loose, except by turning the screw in the opposite direction.

If desired, the screw can be permanently secured to the plate g, and the shank made round, so that it can be turned on the-screw until drawn home to its place in the cavity of the knob, and there keyed to prevent turning. But the mode of construction first above described I consider the best.

What I claim as my invention, and desire to secure 

